/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/Widgets/SNiagaraFilterBox.h
The primary access point to use different applicable filters. Can be configured to add a source, library and template filter and offers callbacks via delegates to execute logic when the filter states change.
class SNiagaraFilterBox : public [SCompoundWidget](API\Runtime\SlateCore\Widgets\SCompoundWidget)